Speaker
Description
Thanks to its properties and the technical success of its production, terahertz (THz) radiation is widely used in various fields from agriculture, medicine, and pharmacy to security, high-speed telecommunications, and fundamental research [1]. However, despite the wide variety of THz detectors operating on the basis of diverse phenomena [2], there is still room for their improvement. In our work, we theoretically analyze the possibilities of creating spin-based detectors that would be sensitive to the magnetic component of THz radiation [3]. Such approach could either provide information about the entire pulse by itself, or supplement the information obtained in another way from the electrical component, expanding the possibilities or improving the accuracy. We explore capabilities of such sensors and provide an analysis of potential candidates among ferromagnetic materials [4]. We analyze the role of individual parameters of both the THz pulse magnetic field and the parameters of ferromagnetic materials in magnetic dynamics under the influence of a THz pulse. During the action of the THz radiation, the magnetic dynamics is predominantly determined by the parameters of the pulse and is practically the same for various ferromagnets. This gave us the opportunity to propose an approach that allows to choose pulse parameters (frequency, phase, half-width and the maximum amplitude) to ensure the desired magnetization behavior. The magnetization behavior after the termination of the action of THz radiation is determined by the parameters of the ferromagnetic samples and differs significantly. We show that the main role in the latter is played by the magnetocrystalline anisotropy constant. Thus, our results can help reveal the limits of the potential applicability and efficiency of the future spin-based sensors.
This work was supported by projects e-INFRA CZ (ID:90254), QM4ST No. CZ.02.01.01/00/2 008/0004572 by The Ministry of Education, Youth and Sports of the Czech Republic, No. 22-35410K and No. 23-04746S of the Czech Science Foundation, MU-23-BG22/00168 of The Ministry of Universities of Spain, and has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 863155.
References
[1]: A. Y. Pawar et al., Drug Invention Today 5 (2013) 157
[2]: R. A. Lewis, Journal of Physics D: Applied Physics 52 (2019) 433001
[3]: I. Korniienko et al., Phys. Rev. Applied 21 (2024) 014025
[4]: I. Korniienko et al., IEEE Sensors Journal (2024) (doi: 10.1109/JSEN.2024.3451973)
